The answer is they are all right. This is why placement is key in understanding what the humidity around, inside, below, above the plants is. Usually easily seen is outside the tent will be lowest with intake area similar in the middle of the plants can be similar, higher or very high depending on airflow. Likewise above the plants or exhaust. This info can be used to help determine adequate air exchange.
The humidity we need to be concerned about is at the bottom of the leaves and middle of the plants IMO.